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package eu.dnetlib.utils.parser;
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import java.io.StringReader;
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import java.text.ParseException;
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import java.text.SimpleDateFormat;
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import java.util.Date;
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import javax.xml.xpath.XPath;
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import javax.xml.xpath.XPathConstants;
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import javax.xml.xpath.XPathExpression;
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import javax.xml.xpath.XPathExpressionException;
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import javax.xml.xpath.XPathFactory;
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import org.apache.log4j.Logger;
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import org.w3c.dom.NodeList;
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import org.xml.sax.InputSource;
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public class Parser {
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private String xml = null;
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private XPathFactory factory = XPathFactory.newInstance();
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private XPath xPath = factory.newXPath();
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private Logger logger = Logger.getLogger(Parser.class);
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public Parser(String xml) {
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this.xml = xml;
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}
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public String getValue(String field) {
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NodeList nodes = extractXPath(field);
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if (nodes != null && nodes.getLength() > 0) {
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return nodes.item(0).getAttributes().getNamedItem("value").getNodeValue();
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}
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return null;
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}
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public String getValue(String field, String[] values) {
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if (field.split("\\.").length <= values.length) {
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logger.debug("Wrong value request");
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return null;
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}
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NodeList nodes = extractXPath(field, values);
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if (nodes != null && nodes.getLength() > 0) {
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return nodes.item(0).getAttributes().getNamedItem("value").getNodeValue();
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}
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return null;
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}
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public Boolean getBoolean(String field) {
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NodeList nodes = extractXPath(field);
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if (nodes != null && nodes.getLength() > 0) {
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return Boolean.parseBoolean(nodes.item(0).getAttributes().getNamedItem("value").getNodeValue());
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}
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return null;
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}
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public Date getDate(String field, String format) {
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NodeList nodes = extractXPath(field);
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try {
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if (nodes != null && nodes.getLength() > 0) {
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return new SimpleDateFormat(format).parse(nodes.item(0).getAttributes().getNamedItem("value").getNodeValue());
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}
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} catch (ParseException pe) {
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logger.debug("Parsing of date failed. ", pe);
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} catch (IllegalArgumentException iae) {
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logger.debug("Parsing of date failed. ", iae);
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}
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return null;
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}
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public Integer getInteger(String field) {
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NodeList nodes = extractXPath(field);
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try {
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if (nodes != null && nodes.getLength() > 0) {
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return Integer.parseInt(nodes.item(0).getAttributes().getNamedItem("value").getNodeValue());
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}
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} catch (NumberFormatException pe) {
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logger.debug("Parsing integer failed. " + pe);
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}
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return null;
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}
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public String[] getValues(String field) {
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NodeList nodes = extractXPath(field);
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if (nodes != null && nodes.getLength() > 0) {
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String[] values = new String[nodes.getLength()];
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for (int i = 0; i < nodes.getLength(); i++) {
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values[i] = nodes.item(i).getAttributes().getNamedItem("value").getNodeValue();
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}
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return values;
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}
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return null;
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}
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public String[] getValues(String field, String[] values) {
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if (field.split("\\.").length <= values.length) {
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logger.debug("Wrong value request");
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return null;
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}
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NodeList nodes = extractXPath(field, values);
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if (nodes != null && nodes.getLength() > 0) {
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String[] fieldvalues = new String[nodes.getLength()];
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for (int i = 0; i < nodes.getLength(); i++) {
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fieldvalues[i] = nodes.item(i).getAttributes().getNamedItem("value").getNodeValue();
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}
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return fieldvalues;
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}
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return null;
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}
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public Integer[] getIntegers(String field) {
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NodeList nodes = extractXPath(field);
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if (nodes != null && nodes.getLength() > 0) {
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Integer[] values = new Integer[nodes.getLength()];
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for (int i = 0; i < nodes.getLength(); i++) {
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try {
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values[i] = Integer.parseInt(nodes.item(i).getAttributes().getNamedItem("value").getNodeValue());
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} catch (NumberFormatException pe) {
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values[i] = null;
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logger.debug("Parsing integer failed. " + pe);
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}
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}
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return values;
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}
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return null;
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}
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private NodeList extractXPath(String field) {
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String expression = "/result";
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String[] fieldnames = field.split("\\.");
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for ( int i=0; i < fieldnames.length; i++ ) {
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expression += "/field[@name=\"" + fieldnames[i] +"\"]";
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}
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try {
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XPathExpression xPathExpression = xPath.compile(expression);
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NodeList nodes = (NodeList) xPathExpression.evaluate(new InputSource(new StringReader(xml)), XPathConstants.NODESET);
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return nodes;
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} catch (XPathExpressionException e) {
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return null;
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}
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}
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private NodeList extractXPath(String field, Object values) {
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String expression = "/result";
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String[] fieldnames = field.split("\\.");
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String[] fieldvalues = (String[]) values;
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for ( int i=0; i < fieldnames.length; i++ ) {
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if (i < fieldnames.length-1) {
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expression += "/field[@name=\"" + fieldnames[i] +"\"]" + "[@value=\"" + fieldvalues[i] + "\"]";
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} else {
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expression += "/field[@name=\"" + fieldnames[i] +"\"]";
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}
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}
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try {
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XPathExpression xPathExpression = xPath.compile(expression);
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NodeList nodes = (NodeList) xPathExpression.evaluate(new InputSource(new StringReader(xml)), XPathConstants.NODESET);
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if(nodes.getLength() == 0) return null;
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return nodes;
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} catch (XPathExpressionException e) {
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return null;
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}
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}
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}
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